Air-fuel ratio control apparatus

Details Air-fuel ratio control apparatus Air-fuel ratio control apparatus

1991-03-15

1992-04-28

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Including cylinder pressure or temperature responsive means

123494, 73116, F02D 4104

Patent

active

051078163

ABSTRACT:
There is provided an air-flow ratio control apparatus for an internal combustion engine, which comprises a means for measuring a flow amount of intake air, a means for assuming an amount of intake air filled in a surge tank, and means for assuming an amount of exhaust gas remaining in a combustion chamber, and controls a feed amount of fuel based on the result of an assumption effected by these means. Therefore, according to the present invention, an amount of intake air supplied into each cylinder can be precisely measured, an air-flow ratio can be kept constant even in a transient state such as in acceleration or deceleration, and NOx, CO and HC contained in exhaust gas can be reduced. Further, with this arrangement, the size of a conventional ternary catalyst can be reduced.

REFERENCES:
patent: 4621603 (1986-11-01), Matekunas
patent: 4785785 (1988-11-01), Oba et al.
patent: 4846130 (1989-07-01), Jensen
patent: 4905654 (1990-03-01), Katsuno et al.
patent: 4942860 (1990-07-01), Chujo et al.
patent: 4962739 (1990-10-01), Wataya
patent: 4996960 (1991-03-01), Nishiyama et al.

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